CT-S-025 (1/6)
Mar. 7, 2012
CT-S-025 / 796-94437
Repair of damaged rotor journal portion
REASON FOR SUGGESTION:
A turbine rotor journal portion may have its surface damaged during operation about 0.3mm in depth for the
maximum and the damage interferes with operation. The repair is highly desirable because the rotor is expensive
and has long delivery time to do the replacement.
When the damage depth is lower than 0.2mm, repair can be done by chrome plating. But when the damage depth
exceeds 0.2mm, plating thickness becomes 0.3mm, considering grinding margin. At this thickness, chrome plating
becomes easy to flake off because of the increase in plating residual stress.
Conventionally, we have repaired deeply damaged rotor journal portion by under-sizing the journal diameter.
However, interchangeability with the spare rotor journal bearing disappears for this case, and the customer will have
difficulty in inventory control. Moreover, the necessity for stocking special sized bearing arises.
To avoid such a trouble, we researched repairing technology for the turbine journal portion that can be applied to the
rotor with the blades installed.
As a result, we established the repair technology by High Velocity Oxygen Fuel (HVOF) coating.
DETAILS OF SUGGESTION:
The outline of repairing is as follows.
1) High Velocity Oxygen Fuel (HVOF) coating can repair damaged rotor journal portion without under-sizing the
journal diameter.
2)
Anti-erosion property of HVOF coating was verified to be better than base material.
3)
Reliability of HVOF coated rotor was confirmed by actual loading test.
MCO Head Office
Customer Service Division
4-6-22, Kan-on-shin-machi, Nishi-ku, Hiroshima,
733-8553 Japan
Phone:
81-82-291-2082
FAX:
81-82-294-1663
Mitsubishi Heavy Industries America, Inc.
Mitsubishi Heavy Industries Europe, Ltd.
Mitsubishi Industrias Pesadas do Brasil, Ltd.
MCO Saudi Arabia, LLC. (MCOSA).
One Houston Center, Suite 3545 1221
McKinney Houston, TX 77010
Phone:
1−713−652−9224
FAX:
1−713−652−9305
4th Floor, International Buildings, 71 Kingsway,
London, WC2B 6ST, United Kingdom
Phone:
44−20−7421−6200
FAX:
44−20−7421−6201
Rua Palmplona 518 2-andar, Cerqueira Cesar,
CEP 01405-000, Sao Paulo, SP, Brasil
Phone:
55−11−3170−9206
FAX:
55−11−3170−9206
P.O. Box 3782, Al-Khobar 31952,
Kingdom of Saudi Arabia
Phone:
966-3-896-5354
CT-S-025 (2/6)
MCO Head Office
Customer Service Division
4-6-22, Kan-on-shin-machi, Nishi-ku, Hiroshima,
733-8553 Japan
Phone:
81-82-291-2082
FAX:
81-82-294-1663
Mitsubishi Heavy Industries America, Inc.
Mitsubishi Heavy Industries Europe, Ltd.
Mitsubishi Industrias Pesadas do Brasil, Ltd.
MCO Saudi Arabia, LLC. (MCOSA).
One Houston Center, Suite 3545 1221
McKinney Houston, TX 77010
Phone:
1−713−652−9224
FAX:
1−713−652−9305
4th Floor, International Buildings, 71 Kingsway,
London, WC2B 6ST, United Kingdom
Phone:
44−20−7421−6200
FAX:
44−20−7421−6201
Rua Palmplona 518 2-andar, Cerqueira Cesar,
CEP 01405-000, Sao Paulo, SP, Brasil
Phone:
55−11−3170−9206
FAX:
55−11−3170−9206
P.O. Box 3782, Al-Khobar 31952,
Kingdom of Saudi Arabia
Phone:
966-3-896-5354
CT-S-025 (3/6)
MCO Head Office
Customer Service Division
4-6-22, Kan-on-shin-machi, Nishi-ku, Hiroshima,
733-8553 Japan
Phone:
81-82-291-2082
FAX:
81-82-294-1663
Mitsubishi Heavy Industries America, Inc.
Mitsubishi Heavy Industries Europe, Ltd.
Mitsubishi Industrias Pesadas do Brasil, Ltd.
MCO Saudi Arabia, LLC. (MCOSA).
One Houston Center, Suite 3545 1221
McKinney Houston, TX 77010
Phone:
1−713−652−9224
FAX:
1−713−652−9305
4th Floor, International Buildings, 71 Kingsway,
London, WC2B 6ST, United Kingdom
Phone:
44−20−7421−6200
FAX:
44−20−7421−6201
Rua Palmplona 518 2-andar, Cerqueira Cesar,
CEP 01405-000, Sao Paulo, SP, Brasil
Phone:
55−11−3170−9206
FAX:
55−11−3170−9206
P.O. Box 3782, Al-Khobar 31952,
Kingdom of Saudi Arabia
Phone:
966-3-896-5354
CT-S-025 (4/6)
MCO Head Office
Customer Service Division
4-6-22, Kan-on-shin-machi, Nishi-ku, Hiroshima,
733-8553 Japan
Phone:
81-82-291-2082
FAX:
81-82-294-1663
Mitsubishi Heavy Industries America, Inc.
Mitsubishi Heavy Industries Europe, Ltd.
Mitsubishi Industrias Pesadas do Brasil, Ltd.
MCO Saudi Arabia, LLC. (MCOSA).
One Houston Center, Suite 3545 1221
McKinney Houston, TX 77010
Phone:
1−713−652−9224
FAX:
1−713−652−9305
4th Floor, International Buildings, 71 Kingsway,
London, WC2B 6ST, United Kingdom
Phone:
44−20−7421−6200
FAX:
44−20−7421−6201
Rua Palmplona 518 2-andar, Cerqueira Cesar,
CEP 01405-000, Sao Paulo, SP, Brasil
Phone:
55−11−3170−9206
FAX:
55−11−3170−9206
P.O. Box 3782, Al-Khobar 31952,
Kingdom of Saudi Arabia
Phone:
966-3-896-5354
CT-S-025 (5/6)
MCO Head Office
Customer Service Division
4-6-22, Kan-on-shin-machi, Nishi-ku, Hiroshima,
733-8553 Japan
Phone:
81-82-291-2082
FAX:
81-82-294-1663
Mitsubishi Heavy Industries America, Inc.
Mitsubishi Heavy Industries Europe, Ltd.
Mitsubishi Industrias Pesadas do Brasil, Ltd.
MCO Saudi Arabia, LLC. (MCOSA).
One Houston Center, Suite 3545 1221
McKinney Houston, TX 77010
Phone:
1−713−652−9224
FAX:
1−713−652−9305
4th Floor, International Buildings, 71 Kingsway,
London, WC2B 6ST, United Kingdom
Phone:
44−20−7421−6200
FAX:
44−20−7421−6201
Rua Palmplona 518 2-andar, Cerqueira Cesar,
CEP 01405-000, Sao Paulo, SP, Brasil
Phone:
55−11−3170−9206
FAX:
55−11−3170−9206
P.O. Box 3782, Al-Khobar 31952,
Kingdom of Saudi Arabia
Phone:
966-3-896-5354
CT-S-025 (6/6)
MCO Head Office
Customer Service Division
4-6-22, Kan-on-shin-machi, Nishi-ku, Hiroshima,
733-8553 Japan
Phone:
81-82-291-2082
FAX:
81-82-294-1663
Mitsubishi Heavy Industries America, Inc.
Mitsubishi Heavy Industries Europe, Ltd.
Mitsubishi Industrias Pesadas do Brasil, Ltd.
MCO Saudi Arabia, LLC. (MCOSA).
One Houston Center, Suite 3545 1221
McKinney Houston, TX 77010
Phone:
1−713−652−9224
FAX:
1−713−652−9305
4th Floor, International Buildings, 71 Kingsway,
London, WC2B 6ST, United Kingdom
Phone:
44−20−7421−6200
FAX:
44−20−7421−6201
Rua Palmplona 518 2-andar, Cerqueira Cesar,
CEP 01405-000, Sao Paulo, SP, Brasil
Phone:
55−11−3170−9206
FAX:
55−11−3170−9206
P.O. Box 3782, Al-Khobar 31952,
Kingdom of Saudi Arabia
Phone:
966-3-896-5354